Hi, please can somebody tell me how to carry on iBooks bug not justifying books despite the style in the code of epub ?

Hi, please can somebody tell me how to carry on iBooks bug not justifying books despite the style in the code of epub ? Of course there is a solution in iBooks settings, but who will know that? Some publishers found how to avoid this bug but I don't know the the hang of it.

Also I wonder why Apple doesn't give a solution. It's their app and their bug no ? Thank you. Nicolas Pewny